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Method for processing vinyl acetate-ethylene copolymerization emulsions wastewater

A technology of ethylene copolymer emulsion and vinyl acetate, applied in water/sewage multi-stage treatment, flotation water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem of unsatisfactory treatment effect and large dosage of coagulant , large amount of scum, etc., to achieve stable and reliable treatment effect, good social and economic benefits, and simple operation.

Inactive Publication Date: 2008-05-07
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] At present, in practical application, the coagulant and treatment process parameters of VAE emulsion wastewater are mostly referred to other emulsified wastewater treatment processes, and there are problems such as unsatisfactory treatment effect, large dosage of coagulant, and large amount of scum.

Method used

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  • Method for processing vinyl acetate-ethylene copolymerization emulsions wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] In this example, the COD of raw water is 3085 mg / L, the turbidity is 2635 NTU, and the pH value is 7.28. Under the condition of G value of 215s-1, add compound high-efficiency coagulant (see attached table 1) 125mg / L, add cationic polyacrylamide 1.5mg / l after 25s, and stir for 8min; control the air flotation device The air flotation pressure is 0.3MPa, and the reflux ratio is 50%. The mixing time of coagulation effluent and dissolved air water is 10min. The effluent water quality indicators are tested, and the COD is reduced to 55.28mg / L, and the turbidity is reduced to 6.0NTU. The equipment is running well and the effluent water quality is stable.

Embodiment 2

[0025] In this example, the COD of raw water is 3612 mg / L, the turbidity is 3210 NTU, and the pH value is 7.18. Under the condition that the G value is 215s-1, add 225mg / L of compound high-efficiency coagulant (see attached table 1 for the composition), add 2.5mg / l of cationic polyacrylamide after 30s, and stir for 8 minutes; control the air flotation device The air flotation pressure is 0.35MPa, and the reflux ratio is 50%. The mixing time of coagulation effluent and dissolved air water is 10min. The effluent water quality indicators are tested, and the COD is reduced to 55.30mg / L, and the turbidity is reduced to 5.5NTU. The equipment is running well and the effluent water quality is stable.

Embodiment 3

[0027] In this embodiment, the COD of the raw water is 4906 mg / L, the turbidity is 4510 NTU, and the pH value is 7.10. Under the condition of G value of 258s-1, add compound high-efficiency coagulant (see attached table 1) 300mg / L, add cationic polyacrylamide 3.2mg / l after 30s, and stir for 10min; control the air flotation device The air flotation pressure is 0.4MPa, and the reflux ratio is 50%. The mixing time of coagulation effluent and dissolved air water is 10min. The effluent water quality indicators are tested, and the COD is reduced to 55.36mg / L, and the turbidity is reduced to 6.5NTU. The equipment is running well and the effluent water quality is stable.

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Abstract

The invention belongs to the field of the environmental protection. The prior vinyl acetate- vinyl copolymer (hereinafter referred as VAE) galactic waste water treatment is mostly referred to other processes of emulsive waste water, having the problems of large coagulant consumption and large amount of float residues. The VAE galactic waste water firstly enters into a coagulation mixing device and then a high effect coagulant is added into; assistant coagulant is added into after coagulating for 20 to 30 seconds; the mixture is put into a floatation tank after being mixed for 6 to 10 minutes at a speed GA of 137-258s-1; the counter flowing water is sucked by a gas-liquid mixing pump to produce dissolved-air water at a pressure of 0.3 to 0.4 MPa within a counter flowing range of 40 to 50 percent; and the waste water and the dissolved-air water enter into a floatation tank for mixing at the same time so as to accomplish the copolymerization floatation for 5 to 10 minutes. The weight percentage of the high effect coagulant is as follow: 80 to 90 percent of ferric trichloride, 3 to 8 percent of sodium sulfate, 2 to 6 percent of lemery, 0 to 5 percent of sodium pyroborate, and 2 to 8 percent of ferric sulfate, all of which are prepared into water solution, the concentration of which is c40-50g / L. The assistant coagulant takes cationic polyacrylamide, and the feeding rate of the polyacrylamide and the high effect coagulant is controlled within 1:125 to 1:80. The water processed by the method disclosed in the invention satisfies the discharge water with the first grade discharge standard required in the GB 8978-1996, and the invention has the advantages of stable efficiency, high effect and low treatment cost.

Description

technical field [0001] The invention belongs to the field of environmental protection, in particular to a treatment method for vinyl acetate-ethylene copolymer emulsion wastewater. Background technique [0002] Vinyl Acetate-Ethylene Copolymer Emulsion (Vinyl Acetate-Ethylene Copolymer Emulsion) is called VAE emulsion for short, and the content of vinyl acetate in the copolymer is generally between 70% and 95% (wt). VAE emulsion is a water-based adhesive that uses water as the dispersion medium, has no health hazards, is an environmentally friendly adhesive, and is widely used in adhesives, coatings, fabric processing, paper processing, construction and other fields. Today, with increasing emphasis on environmental protection, water-based VAE emulsions are becoming more and more popular. The output of VAE emulsions is increasing at a rate of 20% per year. However, in the production process of VAE emulsions, storage tanks, pipelines, Equipment, etc. will inevitably stick to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/02C02F1/52C02F1/24
Inventor 杨艳玲方克华李星彭永臻李圭白
Owner BEIJING UNIV OF TECH
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